[syzbot] [integrity?] [lsm?] KMSAN: uninit-value in ima_add_template_entry
Roberto Sassu
roberto.sassu at huaweicloud.com
Tue Feb 20 10:40:43 UTC 2024
On Mon, 2024-02-19 at 22:41 -0800, syzbot wrote:
> Hello,
>
> syzbot found the following issue on:
>
> HEAD commit: 4f5e5092fdbf Merge tag 'net-6.8-rc5' of git://git.kernel.o..
> git tree: upstream
> console output: https://syzkaller.appspot.com/x/log.txt?x=135ba81c180000
> kernel config: https://syzkaller.appspot.com/x/.config?x=e3dd779fba027968
> dashboard link: https://syzkaller.appspot.com/bug?extid=7bc44a489f0ef0670bd5
> compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
>
> Unfortunately, I don't have any reproducer for this issue yet.
>
> Downloadable assets:
> disk image: https://storage.googleapis.com/syzbot-assets/34924e0466d4/disk-4f5e5092.raw.xz
> vmlinux: https://storage.googleapis.com/syzbot-assets/29d0b1935c61/vmlinux-4f5e5092.xz
> kernel image: https://storage.googleapis.com/syzbot-assets/2e033c3d8679/bzImage-4f5e5092.xz
>
> IMPORTANT: if you fix the issue, please add the following tag to the commit:
> Reported-by: syzbot+7bc44a489f0ef0670bd5 at syzkaller.appspotmail.com
>
> =====================================================
> BUG: KMSAN: uninit-value in ima_add_template_entry+0x52b/0x870 security/integrity/ima/ima_queue.c:172
> ima_add_template_entry+0x52b/0x870 security/integrity/ima/ima_queue.c:172
> ima_store_template security/integrity/ima/ima_api.c:122 [inline]
> ima_store_measurement+0x371/0x8d0 security/integrity/ima/ima_api.c:376
> process_measurement+0x2c6e/0x3ef0 security/integrity/ima/ima_main.c:367
> ima_file_check+0xb3/0x100 security/integrity/ima/ima_main.c:557
> do_open fs/namei.c:3643 [inline]
> path_openat+0x4d09/0x5ad0 fs/namei.c:3798
> do_filp_open+0x20d/0x590 fs/namei.c:3825
> do_sys_openat2+0x1bf/0x2f0 fs/open.c:1404
> do_sys_open fs/open.c:1419 [inline]
> __do_sys_open fs/open.c:1427 [inline]
> __se_sys_open fs/open.c:1423 [inline]
> __x64_sys_open+0x275/0x2d0 fs/open.c:1423
> do_syscall_x64 arch/x86/entry/common.c:52 [inline]
> do_syscall_64+0xcf/0x1e0 arch/x86/entry/common.c:83
> entry_SYSCALL_64_after_hwframe+0x63/0x6b
>
> <Zero or more stacks not recorded to save memory>
>
> Uninit was stored to memory at:
> sha256_transform lib/crypto/sha256.c:117 [inline]
> sha256_transform_blocks+0x2dbf/0x2e80 lib/crypto/sha256.c:127
> lib_sha256_base_do_update include/crypto/sha256_base.h:63 [inline]
> sha256_update+0x2fb/0x340 lib/crypto/sha256.c:136
> crypto_sha256_update+0x37/0x60 crypto/sha256_generic.c:39
> crypto_shash_update+0x75/0xa0 crypto/shash.c:70
> ima_calc_file_hash_tfm security/integrity/ima/ima_crypto.c:496 [inline]
> ima_calc_file_shash security/integrity/ima/ima_crypto.c:516 [inline]
> ima_calc_file_hash+0x1816/0x3cc0 security/integrity/ima/ima_crypto.c:573
> ima_collect_measurement+0x44d/0xdd0 security/integrity/ima/ima_api.c:290
> process_measurement+0x2936/0x3ef0 security/integrity/ima/ima_main.c:359
> ima_file_check+0xb3/0x100 security/integrity/ima/ima_main.c:557
> do_open fs/namei.c:3643 [inline]
> path_openat+0x4d09/0x5ad0 fs/namei.c:3798
> do_filp_open+0x20d/0x590 fs/namei.c:3825
> do_sys_openat2+0x1bf/0x2f0 fs/open.c:1404
> do_sys_open fs/open.c:1419 [inline]
> __do_sys_open fs/open.c:1427 [inline]
> __se_sys_open fs/open.c:1423 [inline]
> __x64_sys_open+0x275/0x2d0 fs/open.c:1423
> do_syscall_x64 arch/x86/entry/common.c:52 [inline]
> do_syscall_64+0xcf/0x1e0 arch/x86/entry/common.c:83
> entry_SYSCALL_64_after_hwframe+0x63/0x6b
>
> Uninit was stored to memory at:
> sha256_transform lib/crypto/sha256.c:117 [inline]
> sha256_transform_blocks+0x2dbf/0x2e80 lib/crypto/sha256.c:127
> lib_sha256_base_do_update include/crypto/sha256_base.h:63 [inline]
> sha256_update+0x2fb/0x340 lib/crypto/sha256.c:136
> crypto_sha256_update+0x37/0x60 crypto/sha256_generic.c:39
> crypto_shash_update+0x75/0xa0 crypto/shash.c:70
> ima_calc_file_hash_tfm security/integrity/ima/ima_crypto.c:496 [inline]
> ima_calc_file_shash security/integrity/ima/ima_crypto.c:516 [inline]
> ima_calc_file_hash+0x1816/0x3cc0 security/integrity/ima/ima_crypto.c:573
> ima_collect_measurement+0x44d/0xdd0 security/integrity/ima/ima_api.c:290
> process_measurement+0x2936/0x3ef0 security/integrity/ima/ima_main.c:359
> ima_file_check+0xb3/0x100 security/integrity/ima/ima_main.c:557
> do_open fs/namei.c:3643 [inline]
> path_openat+0x4d09/0x5ad0 fs/namei.c:3798
> do_filp_open+0x20d/0x590 fs/namei.c:3825
> do_sys_openat2+0x1bf/0x2f0 fs/open.c:1404
> do_sys_open fs/open.c:1419 [inline]
> __do_sys_open fs/open.c:1427 [inline]
> __se_sys_open fs/open.c:1423 [inline]
> __x64_sys_open+0x275/0x2d0 fs/open.c:1423
> do_syscall_x64 arch/x86/entry/common.c:52 [inline]
> do_syscall_64+0xcf/0x1e0 arch/x86/entry/common.c:83
> entry_SYSCALL_64_after_hwframe+0x63/0x6b
>
> Uninit was stored to memory at:
> BLEND_OP lib/crypto/sha256.c:61 [inline]
> sha256_transform lib/crypto/sha256.c:91 [inline]
> sha256_transform_blocks+0xf33/0x2e80 lib/crypto/sha256.c:127
> lib_sha256_base_do_update include/crypto/sha256_base.h:63 [inline]
> sha256_update+0x2fb/0x340 lib/crypto/sha256.c:136
> crypto_sha256_update+0x37/0x60 crypto/sha256_generic.c:39
> crypto_shash_update+0x75/0xa0 crypto/shash.c:70
> ima_calc_file_hash_tfm security/integrity/ima/ima_crypto.c:496 [inline]
> ima_calc_file_shash security/integrity/ima/ima_crypto.c:516 [inline]
> ima_calc_file_hash+0x1816/0x3cc0 security/integrity/ima/ima_crypto.c:573
> ima_collect_measurement+0x44d/0xdd0 security/integrity/ima/ima_api.c:290
> process_measurement+0x2936/0x3ef0 security/integrity/ima/ima_main.c:359
> ima_file_check+0xb3/0x100 security/integrity/ima/ima_main.c:557
> do_open fs/namei.c:3643 [inline]
> path_openat+0x4d09/0x5ad0 fs/namei.c:3798
> do_filp_open+0x20d/0x590 fs/namei.c:3825
> do_sys_openat2+0x1bf/0x2f0 fs/open.c:1404
> do_sys_open fs/open.c:1419 [inline]
> __do_sys_open fs/open.c:1427 [inline]
> __se_sys_open fs/open.c:1423 [inline]
> __x64_sys_open+0x275/0x2d0 fs/open.c:1423
> do_syscall_x64 arch/x86/entry/common.c:52 [inline]
> do_syscall_64+0xcf/0x1e0 arch/x86/entry/common.c:83
> entry_SYSCALL_64_after_hwframe+0x63/0x6b
>
> Uninit was stored to memory at:
> BLEND_OP lib/crypto/sha256.c:61 [inline]
> sha256_transform lib/crypto/sha256.c:92 [inline]
> sha256_transform_blocks+0xf7d/0x2e80 lib/crypto/sha256.c:127
> lib_sha256_base_do_update include/crypto/sha256_base.h:63 [inline]
> sha256_update+0x2fb/0x340 lib/crypto/sha256.c:136
> crypto_sha256_update+0x37/0x60 crypto/sha256_generic.c:39
> crypto_shash_update+0x75/0xa0 crypto/shash.c:70
> ima_calc_file_hash_tfm security/integrity/ima/ima_crypto.c:496 [inline]
> ima_calc_file_shash security/integrity/ima/ima_crypto.c:516 [inline]
> ima_calc_file_hash+0x1816/0x3cc0 security/integrity/ima/ima_crypto.c:573
> ima_collect_measurement+0x44d/0xdd0 security/integrity/ima/ima_api.c:290
> process_measurement+0x2936/0x3ef0 security/integrity/ima/ima_main.c:359
> ima_file_check+0xb3/0x100 security/integrity/ima/ima_main.c:557
> do_open fs/namei.c:3643 [inline]
> path_openat+0x4d09/0x5ad0 fs/namei.c:3798
> do_filp_open+0x20d/0x590 fs/namei.c:3825
> do_sys_openat2+0x1bf/0x2f0 fs/open.c:1404
> do_sys_open fs/open.c:1419 [inline]
> __do_sys_open fs/open.c:1427 [inline]
> __se_sys_open fs/open.c:1423 [inline]
> __x64_sys_open+0x275/0x2d0 fs/open.c:1423
> do_syscall_x64 arch/x86/entry/common.c:52 [inline]
> do_syscall_64+0xcf/0x1e0 arch/x86/entry/common.c:83
> entry_SYSCALL_64_after_hwframe+0x63/0x6b
>
> Uninit was stored to memory at:
> BLEND_OP lib/crypto/sha256.c:61 [inline]
> sha256_transform lib/crypto/sha256.c:93 [inline]
> sha256_transform_blocks+0xfb5/0x2e80 lib/crypto/sha256.c:127
> lib_sha256_base_do_update include/crypto/sha256_base.h:63 [inline]
> sha256_update+0x2fb/0x340 lib/crypto/sha256.c:136
> crypto_sha256_update+0x37/0x60 crypto/sha256_generic.c:39
> crypto_shash_update+0x75/0xa0 crypto/shash.c:70
> ima_calc_file_hash_tfm security/integrity/ima/ima_crypto.c:496 [inline]
> ima_calc_file_shash security/integrity/ima/ima_crypto.c:516 [inline]
> ima_calc_file_hash+0x1816/0x3cc0 security/integrity/ima/ima_crypto.c:573
> ima_collect_measurement+0x44d/0xdd0 security/integrity/ima/ima_api.c:290
> process_measurement+0x2936/0x3ef0 security/integrity/ima/ima_main.c:359
> ima_file_check+0xb3/0x100 security/integrity/ima/ima_main.c:557
> do_open fs/namei.c:3643 [inline]
> path_openat+0x4d09/0x5ad0 fs/namei.c:3798
> do_filp_open+0x20d/0x590 fs/namei.c:3825
> do_sys_openat2+0x1bf/0x2f0 fs/open.c:1404
> do_sys_open fs/open.c:1419 [inline]
> __do_sys_open fs/open.c:1427 [inline]
> __se_sys_open fs/open.c:1423 [inline]
> __x64_sys_open+0x275/0x2d0 fs/open.c:1423
> do_syscall_x64 arch/x86/entry/common.c:52 [inline]
> do_syscall_64+0xcf/0x1e0 arch/x86/entry/common.c:83
> entry_SYSCALL_64_after_hwframe+0x63/0x6b
>
> Uninit was stored to memory at:
> LOAD_OP lib/crypto/sha256.c:56 [inline]
> sha256_transform lib/crypto/sha256.c:82 [inline]
> sha256_transform_blocks+0x2c35/0x2e80 lib/crypto/sha256.c:127
> lib_sha256_base_do_update include/crypto/sha256_base.h:63 [inline]
> sha256_update+0x2fb/0x340 lib/crypto/sha256.c:136
> crypto_sha256_update+0x37/0x60 crypto/sha256_generic.c:39
> crypto_shash_update+0x75/0xa0 crypto/shash.c:70
> ima_calc_file_hash_tfm security/integrity/ima/ima_crypto.c:496 [inline]
> ima_calc_file_shash security/integrity/ima/ima_crypto.c:516 [inline]
> ima_calc_file_hash+0x1816/0x3cc0 security/integrity/ima/ima_crypto.c:573
> ima_collect_measurement+0x44d/0xdd0 security/integrity/ima/ima_api.c:290
> process_measurement+0x2936/0x3ef0 security/integrity/ima/ima_main.c:359
> ima_file_check+0xb3/0x100 security/integrity/ima/ima_main.c:557
> do_open fs/namei.c:3643 [inline]
> path_openat+0x4d09/0x5ad0 fs/namei.c:3798
> do_filp_open+0x20d/0x590 fs/namei.c:3825
> do_sys_openat2+0x1bf/0x2f0 fs/open.c:1404
> do_sys_open fs/open.c:1419 [inline]
> __do_sys_open fs/open.c:1427 [inline]
> __se_sys_open fs/open.c:1423 [inline]
> __x64_sys_open+0x275/0x2d0 fs/open.c:1423
> do_syscall_x64 arch/x86/entry/common.c:52 [inline]
> do_syscall_64+0xcf/0x1e0 arch/x86/entry/common.c:83
> entry_SYSCALL_64_after_hwframe+0x63/0x6b
If I understood what the report is saying (ima_calc_file_hash_tfm()):
while (offset < i_size) {
int rbuf_len;
rbuf_len = integrity_kernel_read(file, offset, rbuf, PAGE_SIZE);
if (rbuf_len < 0) {
rc = rbuf_len;
break;
}
if (rbuf_len == 0) { /* unexpected EOF */
rc = -EINVAL;
break;
}
offset += rbuf_len;
rc = crypto_shash_update(shash, rbuf, rbuf_len);
if (rc)
break;
}
we are reading a non-initialized rbuf, which should not happen because
integrity_kernel_read() returned a positive value (success).
The other information we have is that the filesystem in question uses
generic_file_read_iter() as read_iter method.
I would add the VFS people in CC, in case they have some ideas.
Thanks
Roberto
> Uninit was stored to memory at:
> memcpy_to_iter lib/iov_iter.c:65 [inline]
> iterate_kvec include/linux/iov_iter.h:85 [inline]
> iterate_and_advance2 include/linux/iov_iter.h:251 [inline]
> iterate_and_advance include/linux/iov_iter.h:271 [inline]
> _copy_to_iter+0x125a/0x2520 lib/iov_iter.c:186
> copy_page_to_iter+0x419/0x870 lib/iov_iter.c:381
> copy_folio_to_iter include/linux/uio.h:181 [inline]
> filemap_read+0xbf4/0x14d0 mm/filemap.c:2654
> generic_file_read_iter+0x136/0xad0 mm/filemap.c:2784
> __kernel_read+0x724/0xce0 fs/read_write.c:434
> integrity_kernel_read+0x77/0x90 security/integrity/iint.c:221
> ima_calc_file_hash_tfm security/integrity/ima/ima_crypto.c:485 [inline]
> ima_calc_file_shash security/integrity/ima/ima_crypto.c:516 [inline]
> ima_calc_file_hash+0x1743/0x3cc0 security/integrity/ima/ima_crypto.c:573
> ima_collect_measurement+0x44d/0xdd0 security/integrity/ima/ima_api.c:290
> process_measurement+0x2936/0x3ef0 security/integrity/ima/ima_main.c:359
> ima_file_check+0xb3/0x100 security/integrity/ima/ima_main.c:557
> do_open fs/namei.c:3643 [inline]
> path_openat+0x4d09/0x5ad0 fs/namei.c:3798
> do_filp_open+0x20d/0x590 fs/namei.c:3825
> do_sys_openat2+0x1bf/0x2f0 fs/open.c:1404
> do_sys_open fs/open.c:1419 [inline]
> __do_sys_open fs/open.c:1427 [inline]
> __se_sys_open fs/open.c:1423 [inline]
> __x64_sys_open+0x275/0x2d0 fs/open.c:1423
> do_syscall_x64 arch/x86/entry/common.c:52 [inline]
> do_syscall_64+0xcf/0x1e0 arch/x86/entry/common.c:83
> entry_SYSCALL_64_after_hwframe+0x63/0x6b
>
> Uninit was created at:
> __alloc_pages+0x9a6/0xe00 mm/page_alloc.c:4590
> alloc_pages_mpol+0x62b/0x9d0 mm/mempolicy.c:2133
> alloc_pages mm/mempolicy.c:2204 [inline]
> folio_alloc+0x1da/0x380 mm/mempolicy.c:2211
> filemap_alloc_folio+0xa5/0x430 mm/filemap.c:975
> page_cache_ra_unbounded+0x2cc/0x960 mm/readahead.c:247
> do_page_cache_ra mm/readahead.c:299 [inline]
> page_cache_ra_order+0xe31/0xee0 mm/readahead.c:544
> ondemand_readahead+0x157d/0x1750 mm/readahead.c:666
> page_cache_sync_ra+0x724/0x760 mm/readahead.c:693
> page_cache_sync_readahead include/linux/pagemap.h:1300 [inline]
> filemap_get_pages+0x4c4/0x2bd0 mm/filemap.c:2498
> filemap_read+0x59e/0x14d0 mm/filemap.c:2594
> generic_file_read_iter+0x136/0xad0 mm/filemap.c:2784
> __kernel_read+0x724/0xce0 fs/read_write.c:434
> integrity_kernel_read+0x77/0x90 security/integrity/iint.c:221
> ima_calc_file_hash_tfm security/integrity/ima/ima_crypto.c:485 [inline]
> ima_calc_file_shash security/integrity/ima/ima_crypto.c:516 [inline]
> ima_calc_file_hash+0x1743/0x3cc0 security/integrity/ima/ima_crypto.c:573
> ima_collect_measurement+0x44d/0xdd0 security/integrity/ima/ima_api.c:290
> process_measurement+0x2936/0x3ef0 security/integrity/ima/ima_main.c:359
> ima_file_check+0xb3/0x100 security/integrity/ima/ima_main.c:557
> do_open fs/namei.c:3643 [inline]
> path_openat+0x4d09/0x5ad0 fs/namei.c:3798
> do_filp_open+0x20d/0x590 fs/namei.c:3825
> do_sys_openat2+0x1bf/0x2f0 fs/open.c:1404
> do_sys_open fs/open.c:1419 [inline]
> __do_sys_open fs/open.c:1427 [inline]
> __se_sys_open fs/open.c:1423 [inline]
> __x64_sys_open+0x275/0x2d0 fs/open.c:1423
> do_syscall_x64 arch/x86/entry/common.c:52 [inline]
> do_syscall_64+0xcf/0x1e0 arch/x86/entry/common.c:83
> entry_SYSCALL_64_after_hwframe+0x63/0x6b
>
> CPU: 1 PID: 9243 Comm: syz-executor.3 Not tainted 6.8.0-rc4-syzkaller-00180-g4f5e5092fdbf #0
> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024
> =====================================================
>
>
> ---
> This report is generated by a bot. It may contain errors.
> See https://goo.gl/tpsmEJ for more information about syzbot.
> syzbot engineers can be reached at syzkaller at googlegroups.com.
>
> syzbot will keep track of this issue. See:
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>
> If the report is already addressed, let syzbot know by replying with:
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>
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>
> If the report is a duplicate of another one, reply with:
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>
> If you want to undo deduplication, reply with:
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